mailgraph doesnt start

[Miguel]

Hi, i just installed mailgraph from ports, the install process finished 
without any error, i added

mailgraph_enable="YES"

to rc.conf, but mailgraph doesnt start:

mailfilter# /usr/local/etc/rc.d/mailgraph start
Starting mailgraph.
mailfilter# echo $?
0
mailfilter# ps aux | grep mail
root      6570  0.0  0.2  4892  1188  p0  RV    8:47AM   0:00.00 grep 
mail (csh)
mailfilter#

I dont get any error in /var/log/messages, if i run manually (from a 
root console), it starts ok,
what can i check?